doc(namefile.tex): mention of mve package was missing in gwe namefile table (#1927)

Author: emorway-usgs

doc/mf6io/gwe/namefile.tex

@@ -38,6 +38,7 @@ \subsubsection{Explanation of Variables}
 LKE6 & Lake Energy Transport Package & * \\
 MWE6 & Multi-Aquifer Well Energy Transport Package & * \\
 UZE6 & Unsaturated-Zone Energy Transport Package & * \\
+MVE6 & Mover Energy Transport Package \\
 OBS6 & Observations Option \\
 \hline 
 \end{tabular*}